While this can be due to insufficient disk space, another possible cause is having an application control policy to "Prevent Modification of executable files" or to block write attempts made by .exe files.
Isolate first by stopping SMC service (smc -stop). If the live update is successfull after stopping SMC, then check the application control policy for any custom rule-set that blocks modification of executable files and adjust the policy or disable as-necessary.
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